/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.aggregation;

import org.apache.iotdb.tsfile.read.common.TimeRange;
import org.apache.iotdb.tsfile.read.common.block.column.Column;

public class MaxTimeDescAccumulator extends MaxTimeAccumulator {

  // Column should be like: | Time | Value |
  // Value is used to judge isNull()
  @Override
  public int addInput(Column[] column, TimeRange timeRange) {
    int curPositionCount = column[0].getPositionCount();
    long curMinTime = timeRange.getMin();
    long curMaxTime = timeRange.getMax();
    for (int i = 0; i < curPositionCount; i++) {
      long curTime = column[0].getLong(i);
      if (curTime > curMaxTime || curTime < curMinTime) {
        return i;
      }
      if (!column[1].isNull(i)) {
        updateMaxTime(curTime);
        return i;
      }
    }
    return column[0].getPositionCount();
  }

  @Override
  public boolean hasFinalResult() {
    return initResult;
  }
}
